Month Growth rate same period previous year 1971-01-01 7.1428571428571400 1971-02-01 7.0833333333333400 1971-03-01 6.6390041493775900 1971-04-01 7.7868852459016500 1971-05-01 8.1632653061224600 1971-06-01 7.6923076923077000 1971-07-01 8.0971659919028400 1971-08-01 8.0971659919028400 1971-09-01 7.6305220883534200 1971-10-01 7.1713147410358600 1971-11-01 7.1428571428571500 1971-12-01 6.6929133858267800 1972-01-01 6.6666666666666700 1972-02-01 7.3929961089494200 1972-03-01 7.7821011673151800 1972-04-01 7.2243346007604400 1972-05-01 7.1698113207547000 1972-06-01 7.1428571428571500 1972-07-01 7.4906367041198400 1972-08-01 7.8651685393258500 1972-09-01 7.8358208955223700 1972-10-01 8.1784386617100400 1972-11-01 8.5185185185185300 1972-12-01 8.4870848708486900 1973-01-01 8.8235294117647100 1973-02-01 7.9710144927536100 1973-03-01 8.3032490974729100 1973-04-01 8.8652482269503600 1973-05-01 8.8028169014084600 1973-06-01 10.1754385964912000 1973-07-01 10.4529616724739000 1973-08-01 10.0694444444444000 1973-09-01 10.7266435986159000 1973-10-01 9.9656357388316000 1973-11-01 10.2389078498293000 1973-12-01 11.5646258503401000 1974-01-01 12.8378378378378000 1974-02-01 14.4295302013423000 1974-03-01 14.6666666666667000 1974-04-01 15.3094462540717000 1974-05-01 15.5339805825243000 1974-06-01 15.2866242038217000 1974-07-01 15.1419558359621000 1974-08-01 16.0883280757098000 1974-09-01 16.2500000000000000 1974-10-01 19.6875000000000000 1974-11-01 20.7430340557276000 1974-12-01 19.8170731707317000 1975-01-01 18.8622754491018000 1975-02-01 17.0087976539589000 1975-03-01 16.2790697674419000 1975-04-01 17.5141242937853000 1975-05-01 17.3669467787115000 1975-06-01 16.2983425414365000 1975-07-01 16.1643835616438000 1975-08-01 15.4891304347826000 1975-09-01 15.0537634408602000 1975-10-01 12.2715404699739000 1975-11-01 11.0256410256410000 1975-12-01 10.6870229007634000 1976-01-01 10.5793450881612000 1976-02-01 11.0275689223058000 1976-03-01 11.2500000000000000 1976-04-01 10.8173076923077000 1976-05-01 10.9785202863962000 1976-06-01 11.4014251781473000 1976-07-01 11.0849056603774000 1976-08-01 11.5294117647059000 1976-09-01 11.6822429906542000 1976-10-01 11.8604651162791000 1976-11-01 12.7020785219400000 1976-12-01 14.7126436781609000 1977-01-01 14.3507972665148000 1977-02-01 13.7697516930023000 1977-03-01 13.7078651685393000 1977-04-01 13.0151843817787000 1977-05-01 13.7634408602151000 1977-06-01 13.2196162046908000 1977-07-01 12.9511677282378000 1977-08-01 12.4472573839663000 1977-09-01 11.9246861924686000 1977-10-01 11.6424116424116000 1977-11-01 10.4508196721312000 1977-12-01 8.0160320641282600 1978-01-01 7.9681274900398500 1978-02-01 8.3333333333333400 1978-03-01 8.1027667984189800 1978-04-01 7.1017274472168800 1978-05-01 5.8601134215501000 1978-06-01 5.8380414312617800 1978-07-01 6.2030075187970000 1978-08-01 6.1913696060037600 1978-09-01 5.9813084112149600 1978-10-01 5.5865921787709500 1978-11-01 5.3803339517625100 1978-12-01 5.5658627087198400 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4.5171339563862800 1981-11-01 4.5101088646967400 1981-12-01 4.6656298600310900 1982-01-01 4.4822256568778800 1982-02-01 4.3209876543209700 1982-03-01 4.6224961479198800 1982-04-01 4.2553191489361600 1982-05-01 3.7593984962406000 1982-06-01 3.5982008995502100 1982-07-01 3.7425149700598700 1982-08-01 3.5820895522388100 1982-09-01 3.5820895522388100 1982-10-01 3.5767511177347400 1982-11-01 3.5714285714285600 1982-12-01 3.5661218424963100 1983-01-01 3.2544378698224900 1983-02-01 3.4023668639053400 1983-03-01 3.0927835051546400 1983-04-01 3.0612244897959400 1983-05-01 2.7536231884058000 1983-06-01 2.7496382054992800 1983-07-01 2.5974025974026000 1983-08-01 2.5936599423631100 1983-09-01 2.5936599423631100 1983-10-01 2.5899280575539400 1983-11-01 2.7298850574712700 1983-12-01 2.5824964131994100 1984-01-01 2.4355300859598900 1984-02-01 2.5751072961373400 1984-03-01 2.5714285714285600 1984-04-01 2.6874115983026700 1984-05-01 2.9619181946403200 1984-06-01 2.8169014084507100 1984-07-01 3.0942334739803100 1984-08-01 2.9494382022471800 1984-09-01 2.9494382022471800 1984-10-01 3.2258064516129100 1984-11-01 2.9370629370629400 1984-12-01 3.2167832167832200 1985-01-01 3.7762237762237800 1985-02-01 3.4867503486750200 1985-03-01 3.4818941504178300 1985-04-01 3.1680440771350000 1985-05-01 3.2876712328767300 1985-06-01 3.4246575342465800 1985-07-01 3.0013642564802200 1985-08-01 3.1377899045020500 1985-09-01 3.1377899045020500 1985-10-01 2.9891304347826100 1985-11-01 3.1250000000000200 1985-12-01 2.9810298102981100 1986-01-01 2.5606469002695400 1986-02-01 2.5606469002695400 1986-03-01 2.5572005383580100 1986-04-01 2.5367156208277600 1986-05-01 2.1220159151193500 1986-06-01 1.9867549668874200 1986-07-01 2.1192052980132300 1986-08-01 2.1164021164021200 1986-09-01 2.2486772486772500 1986-10-01 2.3746701846965600 1986-11-01 2.2397891963109100 1986-12-01 2.1052631578947200 1987-01-01 2.1024967148488800 1987-02-01 2.2339027595269400 1987-03-01 2.2309711286089300 1987-04-01 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